Rotary-pump-lubricating means



Nov. 4 9 19240 E HILL I ROTARY PUMP LUBRICATING MEANS Filed 001;- 25

INVENTOR ATTORNEY i m w fi i 4 m m 2 2 an intake port 6 leadin Pate tedNev. 4,1924.

UNITED STATES- PATENT OFFICE.

E'BENEZEB HILL, OF SOUTH NORWALK, CONNECTICUT, ASSIG-NOR TO THE HIl'LL COM- PBESSOR & PUMP CO'MPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

ROTARY-PUMP-LUBRICATING MEANS.

Application filed October 25,1923. Serial m'e'zoaoa.

To all whom it may concern: Be it known that I, EBENEZER HILL, a citizen of the United States, residing at South N orwalk, in the county of Fairfield and 6 State of Connecticut, have invented a new and useful Improvement in Rotary-Pump- Lubricating Means, of which the following is a specification. This invention relates to rotary pumps for pumping fluids, of the type having an internally toothed driving gear engaged with an externally toothed driven gear, said gears being mounted eccentric to each other and having a different number of teeth, such a pump and its operation being fully.set forth in my application filed December 20, 1922, Serial No. 607,947.

The object of this invention is to provide pumps ofthis character with a simple and efiicient means for lubricating the wearing surfaces between the gears and walls'of the pumping chamber .in which the gears are located, the circulation of the, lubricating medium being automatically effected by the operation of the pump and providing at the same time a .fluid seal for the joints which will reduce friction and prevent leaka'ge of v the fluid pumped across the faces of the gear teeth, without danger of choking the pump I with lubricant.

This object is attained by providing a duct for the passage of lubricant from the dis-' charge slde of the pump through the casing to the faces of the gears, whereby "lubricant under the influence of-the discharge pressure will be forced to the front ofthe gears, from which locality it willflow outbetween the faces of the gears and the face ofthe end of the-pumping chamber in which the gears are located. v p

Inthe accompanying drawings Fig. T1

shows a central longitudinal section of a pump constructed accordin to this inven-- tion. Fig. 2 shows an end view of the pump .45 with a portion of the headbroken away.

The casing 1 which isgenerally circular in outline contains-a cyl ndrical pumping chamber 2 that is closed at one end by a 3 which is fastened, tothe casing by any 1 suitable means. The casing has an intake passage 4 onfone side anda dischargepassage 5 on the other side, while the head has from the intakepassa'geto the pump'ingc amber and a discharge port 7 leading from the pumping chamber to the discharge passage. Rotatably fitting and .having a slight movement axially in the pumping chamber is a rotor 8. The hub 9 of the rotor is mounted on antifriction bearings 10 the inner race ring 11 of which is fastened to the hub while the outer race ring 12 is fitted so that it may have a slight axial movement in the casing. The driving shaft 13 is splined inthe hub of the rotor so that while the shaft will turn the rotor it will not interfere with the axial movement of the rotor. Fastened in the rotor is an internally toothed gear 14- and engaging the teeth of this gear are the teeth of an externally toothed gear 15. The externally toothed gear is mounted on antifriction bearings 16 arranged in a cavity 17 1n the gear and supported by a stud 18 fastened in the head. The stud is positioned out of line with the driving shaft so that the axis of'the externally toothed gear. will be eccentric with the-axis of the internally toothed gear. One of these gears has more Y teeth than the other and they eoact in a well known manner to effect the pumping or compression of fluids as set forth in the prior application above referred to.

A spring 19 is arranged in a cavity 20 that communicates with the pumping chamber,'in such manner that it thrusts between the end of the cavity and the outer race ring 12 cansingthe bearing to press the edge of the rotor it to be exerted on the back ofthe rotor.

This connectionalso is adapted to conduct back lubricant. which has been forced through the joints of the pump and out invention. a pipe'23 is led from the pipe 21 that leads to t e pressure cavity containing the spring, to a small orifice 24. through the head in front of the gears. This orifice opens into the pumping chamber either on the pitchline of the gears or closely in relation thereto. It is desirable to have the inner end of the orifice 24 open in such position that the faces of theteeth of both the internal and external gears will brush across it, and

slightly forward on the intake .side of the point of sealing engagement or point 25 where the pitch circles of the gearteeth are tangent and the gears fully bottom. At the point 25 during rotation of the gears all of the fluid compressed has-been expelled and on the intake side there is more or less suc- 5 teeth at approximately their pitch lines During operation sometimes the small space between the teeth passes the end of the lubrleating orifice and sometimes the faces'of th teeth passthe orifice, thus the side faces and the engaging surfaces of the gears are constantly lubrlcated in such manner as to ensure freedom froinfriction and yet sealing .of the joints at all points. :Vhenthe pump stops and there is" pressure in the-spigng cav-.

ity back of the. rotor the gears are pressed forward so as to close the orifice and prevent the flooding of the pump with lubricant.

Should however the pump stop with the space between two teeth opposite the lubricant orifice, that space is so small that but little lubricant would get into the pumping chamber between the teeth. There bein rotor and this being under pressure the tendency is for some of that lubricant to flow out around the back and edge of the rotor to keep those joints lubricated and sealed.

With this construction when the pump is started the flow of lubricant is automatically commenced, and when the pump stops the flow of lubricant ends.

The invention claimed is 1. A rotary pump comprising a casing containing a pumping chamber with an intake thereto and a discharge therefrom, a.

rotor rotatable in, and having an axial movement in the pumping chamber, internally toothed and externally toothed intermeshing gears actuated by the rotor for'pumping fluid, an orifice opening through the end wall of the pumping chamber opposite the end faces of the gear teeth, and means for conducting lubricant under discharge pressure to said orifice.

2. A rotary pump comprising a casing containing a pumping chamber with an intake thereto and a discharge therefrom, a rotor rotatable in, and having an axial movement in the pumping chamber, internally toothed and externally toothed intermeshing gears actuated by the rotor for pumping fluid, an orifice opening through the end wall thepumping chamber opposite the end faces of the gear teeth, and means for conducting 8 lubricant under discharge pressure to said orifice.

4. A rotary pump comprising a casing containing a pumping chamber with an" intake thereto, a discharge therefrom anda cavity tatable in'the pumping chamber, internally toothed. and externally toothed intermeshing gears actuated by the rotor for pumping fluid, means for conducting discharge pressure from the pump to said cavity, an orifice opening through the end wall of the pum ing chamber opposite the end faces of t 6" gear teeth, and means for conducting lubricommunicating therewith, a rotor r0- fice.

5. A rotary pump comprising a casing g containing a pumping chamber with an inlubricant 1n the spring chamber back of the take thereto, a discharge therefrom and a cavity communicating therewith, a rotor rotatable' in, and having an axial movement in the pumping chamber, internally toothed and externally toothed intermeshing gears actuated by the rotor for pumping fluid, a spring in said cavity adapted to press therotor and gears axially toward one end of the pumping chamber, means for conduct ing discharge pressure from the pump to said cavity. an orifice opening through the end wall of the pumping chamber opposite the end faces of the gear teeth, and means for conducting lubricant under discharge pressure to said orifice. I

6. A rotary pump comprising a casing containing a pumping chamber with an intake thereto and a discharge therefrom, a rotor rotatable in, and having an axial movement in the pumping chamber, internally toothed and externally toothed intermeshing gears actuated by the rotor for pumping fluid. an orifice opening through the end wall of the pumping chamber opposite the end faces of the gear teeth on the intake side of the point of sealing engage-.

.in, and having an axial movement 1 cant under discharge pressure to said o inent of the 't'th, and means for conduct ing lubricant under discharge pressure to said orifice.

7. A rotary pump comprising a casing containing a pumping chamber with an intake thereto and discharge therefrom, a

der discharge pressure to the back of ,the'

rotor and also to said orifice.

8. A rotary pump comprising a casing containing a pum ing chamber with an intake thereto, a discharge therefrom and a cavity communicating threwith, a rotor roftatablein, and having an axial movement in the pumping chamber, internally toothed and externally toothedintermeshing gears actuated by the rotor foe. umping fluid, means for conducting disc arge pressure from the pump to said cavity, an orifice opening through the end wall of the pumping chamber opposite the pitch lines of the gear teeth, and means connecting the said cavity with said orifice.

9. A rotary pump comprising a casing containing a pumping chamber with an intake thereto and a discharge therefrom, a rotor rotatable in, and havingan axial movement in the pumping cham er, inter nally toothed and externally toothed inter-, meshing gears actuated by the rotor for pumping fiuid, and means for. conducting lubricant under the discharge pressure from the pump through both end walls of the pumping chamber to the back face of the rotor and to the end faces of the gear teeth.

EBENEZER HILL. 

